1 When you think of eating a juicy hamburger, what do you like on it? Pickles? Onions? Giant dinosaur carnivores, or meat eaters, would have loved hamburgers, too. Too bad they didn't have ketchup or mustard to spice up their meals! All they did was eat other dinosaurs...plain. They did clean up their plates well, though.2 Scientists used to put all giant meat eaters into one group. They were called Carnosaurs. The word means "flesh reptile." They used their teeth instead of claws to attack their prey. Scientists thought that all the meat eaters must be related, but now they have a new idea. There are different groups of meat eaters.3 One group was called the Megalosaurs. They were the earliest biped hunters. That meant that they walked upright on two huge hind legs. They had tiny arms with three fingers on each hand. They were great hunters. The only thing they weren't good at was boxing because their arms were so short.